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8th Class Mathematics Cubes and Cube Roots Question Bank Cubes and Cube Roots

  • question_answer
    Identify the digit in the units place of \[\sqrt[3]{21952}\]

    A)  \[8\]                                    

    B)                         \[4\]                    

    C)                         \[6\]                                    

    D)                         \[7\]                    

    Correct Answer: A

    Solution :

    \[21952={{2}^{3}}\times {{2}^{3}}\times {{7}^{3}}\] \[\therefore \]   \[\sqrt[3]{21952}=\sqrt[3]{{{2}^{3}}\times {{2}^{3}}\times {{7}^{3}}}\]                 \[=2\times 2\times 7=28\] \[\therefore \]The required units digit is 8.


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